Multiple stage hydraulic pump



Feb. 2, 1932. w. w. SLOANE 1, I

MULTIPLE STAGE HYDRAULIC PUMP Filed Nov. 5. 1927 Z/ZZ/ m Patented Feb. 2, 1932 g a UNITE wILLImvmiL-sLoAnn, or GHICAGOIILLINOIS, 'assronoa TO GOODMAN-MANUFACTUR- ING'GOMPANY; or CHICAGO, rnnrnors, A oo-aroaa'rron or rnLrno Is constructionand arrangement of such pumps, 1 whereby they may be driven at greater speeds MULTIPLE STAGE HYDRAULIC: 11M? e l Application-filed November 5, 1927. Serial No. 231,214.

I This invention relates to improvements in' multiple stage hydraulic pumps and has tor itsprincipal obiectto provide an improved and without therequirement of-connnon gear reduction devices and produce their ultimate pressure in an efiici'ent and dependable manner-andpracticallyfwithout regard for d fferences in leakage in the'several pump units constituting the different pressure-increasing stages.

As heretofore 'constructed,- hy'draul-ic rotary' or gearpumps have usually {been are ranged in series with all ofthe'pum'ps driven at a definite speed,- but in'fsuch construction, it is usually desirableto rotate the driving member at a speednot -,eXceeding the normal efficiency rate of-one of the pump units. Ac-

cordingly, where relatively high speed prime IDOVGISQELIG"L1S6Cl- 21S"OI instance. electric motors,- it is usually necessary'to interpose gear reduction-devicesbetween the motor and the common pump-driving"member which serves all of the'pump units; or between a common driving member and the pump units.

In'carrying out my invention I provide a series ofseparate pump units with bothdrivingand driven members of-the' first pump 10- tatablydnountedwith respect to the fixed support and with the driven member connected ndependentlyto the drivinginember oi the next succeeding pump, this arrangement being continueduntil t-he'last pump in the se- -ries,-i:n which the part corresponding to the drlven 1nember= 'ofthe p w m P p fixed so .as to form a reaction member for all ofthe precedingpumpunits 7 Thei'invention may be best understood'by reference I to J the}; accompanying drawings, wherein:. I a

Figure 1 is a longitudinal sectional view of a series of pump units constructed in ac cordance with myinve'ntion; and

Figures 2, 3 and are sections taken on' lines--22, 33 and &4: of Figure 1, re-

7 spectively,

Reierring'n'ow to the details'shown in the drawingglhave utilized a series of four hydraulic geared pumps; indicated generally at jinember of; pump 10,

of pumpJfZlQ 10, 21; '31 and 41' respectivelyfas a meansof illuetrating my inventionybut it will be un derstoodzthat any equivalent-types oi'rotary armatureshaft of a motor. 16; which forms."

the prime mover for thecntire pump "system? The drive shaft 11 ofthe firstpump ext'ends "in an'enlarged casing '17 and has a gear-18 fixed thereon and fitting closely Within chamber 19 formed in the casing17. i The jgear'18 1 v is meshed with acompaniongear 20jiotating' 1 about shaft 22 in chamber 20% theitwo gears 18 and 20 together forming the 'moving parts the art. The inlet for the first pump herein consists of aninlet pipe 25. connect'ed with gland 26' mounted on and communicating; with passage 27 extending throughthe cen' ter of shaft .11 into an enlarged chamber 28 formed in one end of the casing 17, thence" of a' pressure pump' ot'a type well known in through passage'29lat one side of theadjoin-' ing chambers. 19 and QOfkwithiri which the gears 18 .and' 20 rotate. Theoutlet forthe first'pumpiconsistsof a passage 3O disposed on theopposite side of connected chambers 19 v 1 f and 20 and communicating with-.the,neXt

pump unit indicated generally at 21 so as to form theinletpassage thereof. The second pump unitshown herein is sim-:

ilar inconstruction to the first pump unit excepting that the parts are reversed so that casing 17 rotates on itsaxisdue to the reac-, tion of the fluid pressurebetween the gears 18 and 20 and'vthefact that it is free to ro-- tate in bearings 35;- 35,'insteadrof being fixed as in usual, pump constructions; The easing-u 17 therefore i constitutes both the reaction andthedrivingmember a, It should 'be' noted that-if thepassageeBO were closed. and the -gear-18:were rotatedf would be, so greatras to, preventrotation of a flu-idbeing allowed to enter the first pump- 1O through-the pipe 25, the fluid pressures the gear20 which would cause said gear to lock withjthe gear 18 and-rotate the'casing.

17 at the speed of rotation of=the driveshaft '11. 'The'amount of opening of the passageway 30 controls the rate of speed of rotation of the casing 17, since the speed of rotation of said casing is dependent upon the speed of rotation of the gear 20.

The second pump unit 21 is similar in construction and operates in the same manner as the first pump unit, excepting that the fluid passes in a direction reverse to that in which it passes through the first unit 10. The sec ond'center shaft 21 corresponds to the first driving shaft 11 and is connected with the aline-d gears in pumps 21 and 31 and thus forms the reaction member of the second pump 21, and the driving member of the third pump 31.

The third and fourth pumps 31 and 41, the latter forming the last pump in the series, are similar to pumps 10 and 21, so their detailed description need not be repeated. They rotate freely in bearings 4:5, 45, similar to bearings 35, 35, already described. However, the last pump 41 has its shaft 12, which constitutes the reaction member of the last pump, fixed in support 46 by suitable keys 47, or their equivalent, instead of being free to rotate. This shaft 42 therefore forms in effect a fixed reaction member for all of the pumps in the series.

It will now be clear from the foregoing description that when the first pump in the series is driven at a given rate of speed, the following pumps will each produce their proportion of increase in pressure with each of the units atv substantially the same speed differential between its driving and driven members but at decreasing rates of revolutions. Since a given volume of fluid enters the pump unit 10 and this same volume of fluid is dischar ed through the pump unit 41 the pressure of this fluid is increased to four times its pressure before entering the pump unit 10 and since the speediof each pump unit decreases as the water pressure increases, this decrease in speed, assuming no leakage in the system, will be proportionate to the increase in pressure and the speed of the fourth unit will be one fourth the speed of the first unit. Thus, if four pump units of similar capacities are used and the first pump is driven at 1000 R. P. M. the first driying member or shaft 11 will rotate at 1000 R. P. M. while the driven member or casing 17 will have a theoretical differential of 250 R. P. M., or 750 R. P. M. speed. The casing 17 forms the driving member of the second pump 21 at 750 R. P. M., so that the shaft 21 or reaction member of the second pump will have ath'eoretical speed of 500 R. P. M. Similarly, the theoretical reduction in speed through pumps 31 and 41 will be 250 R. P. M. each.

In the event that the leakages in the several units are equal, the relative speeds of rotation above mentioned will not be affected. However, with slight variations in leakages asses re of the several pumps (as is often the case), there will be a slight relative increase in working speed of the more leaky pump, with a corresponding decrease in working speed of the more efficient pumps. This arrangement therefore provides an automatic compensation for leakages in the several pump units and assures an equal increase in pressure per stage.

A further advantage of theconstruction and arrangement above described is the provision of a multiple speed reduction within the pump system itself which eliminates the necessity of separate gear reductions where a relatively high speed prime mover, such as an electric motor, is utilized. 5

Although I have shown and described one embodiment of my invent-ion, it will be understood that the construction and arrangementof the various parts may be altered or changed Without departing from the spirit or scope thereof. Furthermore, I do not wish to be construed as limiting myself to the specific form illustrated, excepting as it may be limited in the appended claims. I

I. claim as my invention:

1. In a multiple-stage pump system, a plurality of rotary pump units operatively connected together in series, each rotary pump unit including a driving member and a reaction member, a fluid inlet in each driving member and a fluid discharge in each reaction member, a prime mover connected to the driv ing member of the first unit, the reaction members of each of the units except the last forming the driving members of the next succeeding unit, and the reaction member of the last unit forming the final reaction memher or all the preceding units.

2. In a multiple-stage pump system, a plura ity of rotary pump units operatively connected together in series, each rotary pump unit including a driving member and a reaction member, a fluid inlet in each driving member and a fluid discharge in each re action member, a prime mover driving the first unit. and the driving and reaction members of each of said units being freely rotatable at differential rates relative to each other, with the exception of the reaction member of the last unit, which is fixed to form a final reaction member for the preceding units.

3. In a multiple stage pump system, a

'prin'ie mover, a plurality of rotary pump units each connected together in series, a

drive shaft connected from said prime'mover to said first rotary pump unit, a fluid inlet in said saaft, a casing concentric with said shaft and rotatable thereabout, a driven shaft connected with a second rotary pump unit, said casing serving as a reaction member for said first rotary pump unit and driving member for said secondrotary pump unit, a fluid outlet in said last mentioned shaft, said last mentioned driven shaft ond rotary pump unit and a driving memher for a rotary pump unit succeeding said second rotary pump unit, and a stationary reaction member for the lastv rotary pump unit having a fluid discharge outlet'therein. 4. In a multiple stage pump system, a prime mover, a plurality of rotary pump units each connected together in series, a drive shaft connected from said prime mover to said first rotary pump unit, a fluid inlet in said drive shaft, a casing concentric with said shaft and rotatable thereabout, a driven shaft connected with a second rotary pump unit, said casing serving a'sa reaction member for said first rotary pump unit and a driving member for said second rotary pump unit, and said last mentioned driven shaft having a fluid discharge. outlet therein and constituting'a reactionmember for said second' rotary pump unit and a driving memher for a rotary pump-unit succeeding said second rotary pump unit, the reaction member of the last unit having a fluid discharge i outlet therein and being held in a fixed position to form the final reaction member forv all the preceding units.

5. In a multiple stage pump system, a prime mover, a plurality of rotary geared pump units each connected together in series, a drive shaft connected from said prime mover to a gear in said first rotary pump unit and forming a'driving member for said unit, a fluid inlet in said drive shaft, a cas-- ing concentric with said shaft and rotatable thereabout, a gear within said casing having a shaft driven thereby, a fluid discharge outlet in said last mentioned shaft. said casing constituting a reaction member for said first rotary pump unit and a driving member for said second rotary pump unit, said last men I tioned driven shaft constituting a reaction member for said second rotary pump unit and a drivlng member for a rotary pump unit succeeding sald second rotary pump unit, and a stationary reaction member for the last rotary pump unit having a fluid discharge outlet therein.

6. In a multiple stage pump system, a-

prime mover, a plurality of rotary geared pump units each connected together in serles, a drive shaft connected from said pr1me mover to a gear in sald first rotary pump unit and forming a driving member, for said unit, a fluid inlet in said drive shaft, a casing concentric with said shaft and rotatable thereabout, a gear within said casing having a shaft driven thereby, said casing constituting a reactionmember for said first rotary unit succeeding said'second rotary pump unit,"

and means forholding the reaction member of the last unit in a fixed position to form the final reaction member for all the preceding units, said final reaction member being provided with a fluid discharge opening ber of the last unit comprising a shaft held in a fixed position having a fluid discharge outlet therein and forming the'final reaction member for all the preceding units.

- Signed at'Chicago, in the county of Cook and State of Illinois, this 1st day of Novem- I 0 WILLIAM w. SLOANE.

her, A. D1927.

the last forming the driving members of the next succeeding unit, and the reactionmem pump unit and a driving member for said second rotary pumpunit, and said last mentioned driven shaft havinga fluid discharge outlet therein and constituting a reaction member for said second rotary pump unit and a driving member for a rotary pump 

